public function setEntrance_count($entrance_count = null)
{
// validation for constraint: int
if (!is_null($entrance_count) && !is_numeric($entrance_count)) {
throw new \InvalidArgumentException(sprintf('Invalid value, please provide a numeric value, "%s" given', gettype($entrance_count)), __LINE__);
}
$this->entrance_count = $entrance_count;
return $this;
}